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Arduino Android Bluetooth Communication

由 允我心安 提交于 2019-12-05 20:07:21

I found a way it works. Just I've changed the Android code with this one, it can be useful for somebody who has the same problem!

package bt.andard.btandard;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
  private static final String TAG = "bluetooth2";

  Button btnOn, btnOff;
  TextView txtArduino;
  Handler h;

  final int RECEIVE_MESSAGE = 1;    //1    // Status  for Handler
  private BluetoothAdapter btAdapter = null;
  private BluetoothSocket btSocket = null;
  private StringBuilder sb = new StringBuilder();

  private ConnectedThread mConnectedThread;

  // SPP UUID service
  private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

  // MAC-address of Bluetooth module (you must edit this line)
  private static String address = "00:14:02:13:00:10";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);

     setContentView(R.layout.main);

     btnOn = (Button) findViewById(R.id.btnOn);                  // button LED ON
     btnOff = (Button) findViewById(R.id.btnOff);                // button LED OFF
     txtArduino = (TextView) findViewById(R.id.txtArduino);      // for display the received data             from the Arduino

     h = new Handler() {
     public void handleMessage(android.os.Message msg) {
        switch (msg.what) {
        case RECEIVE_MESSAGE:                                   // if receive massage
            byte[] readBuf = (byte[]) msg.obj;
            String strIncom = new String(readBuf, 0, msg.arg1); // create string from bytes array
            Toast.makeText(getBaseContext(), strIncom, Toast.LENGTH_LONG).show();

            sb.append(strIncom);                                                // append string
            int endOfLineIndex = sb.indexOf("\r\n");                            // determine the end-of-line
            if (endOfLineIndex > 0) {                                            // if end-of-line,
                String sbprint = sb.substring(0, endOfLineIndex);               // extract string
                sb.delete(0, sb.length());                                      // and clear
                txtArduino.setText("Data from Arduino: " + strIncom);            // update TextView
              //  btnOff.setEnabled(true);
              //  btnOn.setEnabled(true); 
            }
            //Log.d(TAG, "...String:"+ sb.toString() +  "Byte:" + msg.arg1 + "...");
            break;
        }
    };
};

btAdapter = BluetoothAdapter.getDefaultAdapter();       // get Bluetooth adapter
checkBTState();

btnOn.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
  //  btnOn.setEnabled(false);
    mConnectedThread.write("1");    // Send "1" via Bluetooth
    //Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
  }
});

btnOff.setOnClickListener(new OnClickListener() {
  public void onClick(View v) {
  //  btnOff.setEnabled(false);  
      mConnectedThread.write("0");    // Send "0" via Bluetooth
    //Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
    }
  });
}

private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
    if(Build.VERSION.SDK_INT >= 10){
        try {
            final Method  m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
          return (BluetoothSocket) m.invoke(device, MY_UUID);
       } catch (Exception e) {
          Log.e(TAG, "Could not create Insecure RFComm Connection",e);
    }
  }
  return  device.createRfcommSocketToServiceRecord(MY_UUID);
}

@Override
public void onResume() {
  super.onResume();

  Log.d(TAG, "...onResume - try connect...");

  // Set up a pointer to the remote node using it's address.
  BluetoothDevice device = btAdapter.getRemoteDevice(address);

  // Two things are needed to make a connection:
  //   A MAC address, which we got above.
  //   A Service ID or UUID.  In this case we are using the
  //     UUID for SPP.

   try {
       btSocket = createBluetoothSocket(device);
   } catch (IOException e) {
       errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
 }

 // Discovery is resource intensive.  Make sure it isn't going on
 // when you attempt to connect and pass your message.
 btAdapter.cancelDiscovery();

 // Establish the connection.  This will block until it connects.
 Log.d(TAG, "...Connecting...");
 try {
     btSocket.connect();
     Log.d(TAG, "....Connection ok...");
 } catch (IOException e) {
 try {
     btSocket.close();
 } catch (IOException e2) {
     errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
 }
}

 // Create a data stream so we can talk to server.
 Log.d(TAG, "...Create Socket...");

 mConnectedThread = new ConnectedThread(btSocket);
 mConnectedThread.start();
}

@Override
public void onPause() {
  super.onPause();

  Log.d(TAG, "...In onPause()...");

  try     {
     btSocket.close();
  } catch (IOException e2) {
     errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
  }
}

private void checkBTState() {
   // Check for Bluetooth support and then check to make sure it is turned on
   // Emulator doesn't support Bluetooth and will return null
   if(btAdapter==null) { 
      errorExit("Fatal Error", "Bluetooth not support");
   } else {
   if (btAdapter.isEnabled()) {
       Log.d(TAG, "...Bluetooth ON...");
   } else {
       //Prompt user to turn on Bluetooth
       Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
       startActivityForResult(enableBtIntent, 1);
   }
  }
 }

private void errorExit(String title, String message){
   Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
   finish();
}

 private class ConnectedThread extends Thread {
     private final InputStream mmInStream;
     private final OutputStream mmOutStream;

     public ConnectedThread(BluetoothSocket socket) {
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        byte[] buffer = new byte[256];  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);        // Get number of bytes and message in "buffer"
                h.obtainMessage(RECEIVE_MESSAGE, bytes, -1, buffer).sendToTarget();     // Send to message queue Handler
            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(String message) {
        Log.d(TAG, "...Data to send: " + message + "...");
        byte[] msgBuffer = message.getBytes();
        try {
            mmOutStream.write(msgBuffer);
        } catch (IOException e) {
            Log.d(TAG, "...Error data send: " + e.getMessage() + "...");     
          }
    }
   }
}
标签
android
bluetooth
arduino
communication
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